gistfile1.js

$(function() {

$statusbar = $('#status-top');

// Only do the rest if we have the statusbar!
if ($statusbar.length > 0) {

    function updateOnlineStatusBar() {
        // ... code to fetch and update
    }

    // Update the status every couple minutes if we leave the page open
    window.setInterval(updateOnlineStatusBar(), 120 * 1000);
    updateOnlineStatusBar();
}

});